High-voltage charging system and method and electric vehicle

Abstract

The invention relates to the technical field of vehicles, in particular to a high-voltage charging system and method and an electric automobile, and the system comprises a charging port and a power battery; the electric drive assembly comprises an inverter and a motor, the inverter is connected into a connecting loop of the charging port and the power battery, and the motor is allowed to be connected with the charging port; the control assembly is used for controlling the electric drive assembly to be connected with the charging port in the charging process, and at least one of boosting, current rising and heating in the charging process is achieved through the electric drive assembly. Therefore, the problems that a current electric vehicle charging framework cannot be matched with a charging pile during actual charging, so that the vehicle cannot be charged, a low-voltage charging pile cannot charge a high-voltage vehicle, or when the high-voltage pile charges the low-voltage vehicle, the high-voltage pile is limited by a charging interface, and the maximum charging current cannot be achieved are solved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a high-voltage charging system, method and electric vehicle. Background Art

[0002] With the rapid development of the electric vehicle market, the construction of charging infrastructure is also advancing. However, in practical applications, the compatibility issue between electric vehicles and charging piles has become increasingly prominent and has become one of the key factors affecting user experience. The charging piles on the current market are mainly divided into three voltage levels: 500V, 750V and 1000V, which reflects the different understandings and implementation strategies of fast charging technology by different manufacturers. The power battery voltage platform of electric vehicles is usually also distributed in these ranges, such as 500 to 750V or 750 to 1000V.

[0003] When an electric vehicle attempts to charge using a charging station that is lower than the voltage range of its battery, the vehicle may not be able to start the charging process properly due to voltage mismatch. For example, if an electric vehicle designed for a 750V to 1000V operating range is connected to a charging station that can only provide 500V output, the vehicle may not be able to accept any power input at all. Conversely, even if a high-voltage charging station can support low-voltage vehicle charging, due to the limitations of the charging interface and the on-board system, the actual charging efficiency is often greatly reduced and the maximum charging current cannot be achieved, thereby extending the charging time and reducing user convenience and satisfaction.

[0004] like Figure 1 The figure shows the high-voltage architecture of a typical pure electric vehicle: K2 is the main positive relay of the battery pack, K4 is the main negative relay of the battery pack, K3 is the pre-charge relay, K6 is the fast charge positive relay, K7 is the fast charge negative relay, R1 is the pre-charge resistor, Q1, Q2, Q3, Q4, Q5, Q6 are the power devices of the motor controller, and C1 is the bus capacitor of the motor controller. The current charging architecture of electric vehicles will encounter the situation that the charging pile cannot be matched during actual charging, resulting in the inability to charge the vehicle. The charging piles on the market currently include 500V, 750V, and 1000V charging piles. When the voltage platform of the power battery of the electric vehicle is in the range of 500 to 750V or 750V to 1000V, there is a low-voltage charging pile that cannot charge the high-voltage vehicle, or when the high-voltage pile charges the low-voltage vehicle, it is limited by the charging interface and cannot reach the maximum charging current. Summary of the invention

[0005] The present application provides a high-voltage charging system, method and electric vehicle to solve the problem that the current electric vehicle charging architecture cannot match the charging pile during actual charging, resulting in the vehicle being unable to charge, and there are problems such as the low-voltage charging pile being unable to charge the high-voltage vehicle, or the high-voltage pile being limited by the charging interface when charging the low-voltage vehicle and being unable to reach the maximum charging current.

[0006] The first aspect of the present application provides a high-voltage charging system, comprising the following steps: a charging port and a power battery; an electric drive component, wherein the electric drive component includes an inverter and a motor, the inverter is connected to a connection circuit between the charging port and the power battery, and the motor is allowed to be connected to the charging port; a control component, used to control the connection of the electric drive component with the charging port during the charging process, and use the electric drive component to achieve at least one of voltage boost, current boost and heating during the charging process.

[0007] Optionally, it is characterized in that the control component includes first to ninth switches, resistors, inductors and first to second capacitors, wherein one end of the first switch is connected to the positive electrode of the power battery, the other end of the first switch is connected to one end of the fifth switch and one end of the inductor, the motor is connected to one end of the inductor, the other end of the fifth switch is respectively connected to the positive electrode of the second capacitor and one end of the ninth switch, the other end of the ninth switch is connected to the positive electrode of the charging port, one end of the second switch is respectively connected to one end of the third switch and the positive electrode of the power battery, the other end of the second switch is respectively connected to one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch, the other end of the sixth switch is connected to the positive electrode of the charging port, the other end of the third switch is connected to the other end of the resistor, one end of the fourth switch is connected to the negative electrode of the power battery, the other end of the fourth resistor is respectively connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch, and the other end of the seventh switch is connected to the negative electrode of the charging port.

[0008] Optionally, the first to ninth switches are relays.

[0009] Optionally, turning off the first to ninth switches realizes the first to fourth modes, and the inverter includes first to sixth power devices.

[0010] Optionally, if the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, and the first switch, the fifth switch and the ninth switch are opened, and the charging pile charges the power battery.

[0011] Optionally, if the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are disconnected, and the second to fifth switches, the seventh switch and the ninth switch are closed. The voltage of the power battery is converted into a first preset voltage through the switching states of the first power device, the third power device and the fifth power device. The voltage of the second capacitor is maintained at an acceptable voltage of the charging pile by storing and releasing energy through the motor and the inductor. The second power device, the fourth power device and the sixth power device are closed to store energy for the motor and the inductor. After the energy storage is completed, the second power device, the fourth power device and the sixth power device are closed. The energy storage of the inductor and the energy of the charging pile are superimposed to charge the power battery through the first power device, the third power device and the fifth power device to increase the charging voltage.

[0012] Optionally, if the target mode of the electric vehicle is the third mode, after the voltage of the second capacitor is charged to the second preset voltage, the second switch, the third switch, the eighth switch and the ninth switch are disconnected, the first switch and the fourth to seventh switches are closed, the first power device, the third power device and the fifth power device are closed, and the charging pile stores energy for the motor and the inductor. After the energy storage is completed, the first power device, the third power device and the fifth power device are disconnected, and the energy of the inductor energy storage and the charging pile is superimposed to charge the power battery through the second power device, the fourth power device and the sixth power device to increase the charging current.

[0013] Optionally, if the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are disconnected, the second to fourth switches and the eighth switch are closed, the first power device, the third power device and the fifth power device are closed, the upper half module of the power battery stores energy for the motor and the inductor, and after the energy storage is completed, the first power device, the third power device and the fifth power device are turned off, the energy stored by the motor and the inductor charges the lower half module of the power battery, and an energy loop is formed through the body diodes of the second power device, the fourth power device and the sixth power device, the second power device, the fourth power device and the sixth power device are turned on, the lower half module of the power battery stores energy for the motor and the inductor, and after the energy storage is completed, the second power device, the fourth power device and the sixth power device are turned off, the energy stored by the motor and the inductor charges the upper half module of the power battery through the first power device, the third power device and the fifth power device, and the pulsed self-heating of the power battery is achieved by controlling the frequency and duty cycle of the opening.

[0014] A second aspect of the present application provides an electric vehicle, comprising the high-voltage charging system of the first aspect.

[0015] A third aspect of the present application provides a high-voltage charging method, which uses the high-voltage charging system of the first aspect for charging, wherein the method includes the following steps: identifying a target mode of the power battery; controlling the closing and opening of switches in a control component of the high-voltage charging system according to the target mode, and forming a target circuit corresponding to the target mode by closing and opening the switches in the control component; and realizing at least one of voltage boosting, current boosting and heating in the charging process based on the target circuit.

[0016] Therefore, this application has at least the following beneficial effects:

[0017] The embodiment of the present application includes a charging port and a power battery, an electric drive component and a control component. The electric drive component includes an inverter and a motor. The inverter is connected to the connection circuit of the charging port and the power battery. The motor is allowed to be connected to the charging port. The control component controls the connection of the electric drive component to the charging port during the charging process. The electric drive component is used to achieve at least one of boosting, current increasing and heating during the charging process, thereby achieving self-heating of the power battery, improving the heating rate and temperature consistency of the power battery, and achieving a composite use of the electric drive system to achieve the lifting function, that is, boost charging, buck charging, and direct charging. Thus, the current electric vehicle charging architecture is solved, which will encounter the situation that the charging pile cannot be matched during actual charging, resulting in the inability to charge the vehicle, and there are problems such as the low-voltage charging pile cannot charge the high-voltage vehicle, or the high-voltage pile is limited by the charging interface when charging the low-voltage vehicle, and the maximum charging current cannot be reached.

[0018] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram of the structure of a high-voltage charging system provided for related technologies;

[0021] Figure 2 A schematic diagram of the structure of a high-voltage charging system provided according to an embodiment of the present application;

[0022] Figure 3 This is an example diagram of a voltage-boosting and current-boosting heating system solution for an electric drive system provided according to an embodiment of the present application;

[0023] Figure 4 A system diagram for direct fast charging according to an embodiment of the present application;

[0024] Figure 5A main circuit diagram of a boost charging mode system provided according to an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a circuit in the charging start phase of a boost charging mode provided according to an embodiment of the present application;

[0026] Figure 7 A schematic diagram of a boost charging mode and buck mode circuit according to an embodiment of the present application;

[0027] Figure 8 A circuit diagram of a charging pile for motor and inductor energy storage in a boost charging mode according to an embodiment of the present application;

[0028] Fig. 9 A schematic diagram of charging a power battery by superimposing the energy of an inductive energy storage and a charging pile to increase the charging voltage according to an embodiment of the present application;

[0029] Fig.10 A main circuit diagram of a current boost charging mode system provided according to an embodiment of the present application;

[0030] Fig.11 A circuit diagram of a charging pile for motor and inductor energy storage in a boost charging mode according to an embodiment of the present application;

[0031] Fig.12 A schematic diagram of charging a power battery by superimposing the energy of an inductive energy storage and a charging pile to increase the charging current according to an embodiment of the present application;

[0032] Fig.13 A main circuit diagram of a battery heating mode system provided according to an embodiment of the present application;

[0033] Fig.14 A schematic diagram of a circuit in which the upper half module battery is a motor and an inductor for energy storage according to an embodiment of the present application;

[0034] Fig.15 A schematic diagram of a circuit for charging the lower half module battery using a motor and inductive energy storage according to an embodiment of the present application;

[0035] Fig.16 A schematic diagram of a circuit for storing energy for a motor and an inductor using a lower half module battery according to an embodiment of the present application;

[0036] Fig.17 A schematic diagram of a circuit for charging the upper module battery by using the energy storage of the inductor provided in one embodiment of the present application to realize the self-heating function;

[0037] Fig.18 The figure is a flow chart of a high-voltage charging method provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0039] The following describes the high-voltage charging system, method and electric vehicle of the embodiment of the present application with reference to the accompanying drawings. In view of the current electric vehicle charging architecture mentioned in the above background technology, when actually charging, the vehicle will encounter the situation that the charging pile cannot be matched, resulting in the vehicle being unable to charge, and there are problems such as the low-voltage charging pile cannot charge the high-voltage vehicle, or the high-voltage pile is limited by the charging interface when charging the low-voltage vehicle, and the maximum charging current cannot be reached. The present application provides a high-voltage charging system, in which a charging port and a power battery, an electric drive component and a control component are included. In the electric drive component, an inverter and a motor are included. The inverter is connected to the connection circuit of the charging port and the power battery, and the motor is allowed to be connected to the charging port. The control component controls the connection of the electric drive component with the charging port during the charging process, and the electric drive component is used to realize at least one of boosting, current increasing and heating during the charging process, realizes self-heating of the power battery, improves the heating rate and temperature consistency of the power battery, and realizes the composite use of the electric drive system to realize the lifting function, that is, boost charging, buck charging and direct charging can be realized. This solves the problem that the current electric vehicle charging architecture cannot match the charging pile during actual charging, resulting in the vehicle being unable to charge, and there are also problems such as the low-voltage charging pile being unable to charge the high-voltage vehicle, or the high-voltage pile being unable to charge the low-voltage vehicle due to the limitations of the charging interface and unable to reach the maximum charging current.

[0040] Specifically, Figure 2 A schematic diagram of a high-voltage charging system provided in an embodiment of the present application.

[0041] like Figure 2 As shown, the high-voltage charging system includes: a charging port 101 , a power battery 102 , an electric drive component 103 , an inverter 104 , a motor 105 and a control component 106 .

[0042] Among them, there are a charging port 101 and a power battery 102; an electric drive component 103, wherein the electric drive component 103 includes an inverter 104 and a motor 105, the inverter 104 is connected to the connection circuit of the charging port 101 and the power battery 102, and the motor 105 is allowed to be connected to the charging port 101; a control component 106, which is used to control the connection of the electric drive component 103 with the charging port 101 during the charging process, and use the electric drive component 103 to achieve at least one of voltage boost, current boost and heating during the charging process.

[0043] It can be understood that the embodiment of the present application includes a charging port 101, a power battery 102, an electric drive component 103, an inverter 104, a motor 105 and a control component 106. The charging port 101 is connected to the power battery 102, and the electric drive component 103 is also integrated together. The electric drive component 103 is composed of an inverter 104 and a motor 105, wherein the inverter 104 is connected between the charging port 101 and the power battery 102, and the motor 105 has the ability to be directly connected to the charging port 101. Through the control and management of the control component 106, the working state of the electric drive component 103 can be flexibly controlled during the charging process, so that it can perform at least one function of boosting voltage, boosting current or heating the battery, thereby optimizing the charging efficiency and ensuring battery performance.

[0044] In the embodiment of the present application, the control component 106 includes first to ninth switches, resistors, inductors and first to second capacitors, wherein one end of the first switch is connected to the positive electrode of the power battery 102, the other end of the first switch is connected to one end of the fifth switch and one end of the inductor, the motor 105 is connected to one end of the inductor, the other end of the fifth switch is respectively connected to the positive electrode of the second capacitor and one end of the ninth switch, the other end of the ninth switch is connected to the positive electrode of the charging port 101, one end of the second switch is respectively connected to one end of the third switch and the positive electrode of the power battery 102, the other end of the second switch is respectively connected to one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch, the other end of the sixth switch is connected to the positive electrode of the charging port 101, the other end of the third switch is connected to the other end of the resistor, one end of the fourth switch is connected to the negative electrode of the power battery 102, the other end of the fourth resistor is respectively connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch, and the other end of the seventh switch is connected to the negative electrode of the charging port 101.

[0045] It can be understood that the control component 106 of the embodiment of the present application integrates the first to ninth switches, a resistor, an inductor, a first capacitor and a second capacitor. Specifically, one end of the first switch is connected to the positive electrode of the power battery 102, and the other end is connected to one end of the fifth switch and one end of the inductor; the motor 105 is also connected to one end of this inductor; the other end of the fifth switch is connected to the positive electrode of the second capacitor and one end of the ninth switch, and the other end of the ninth switch is finally connected to the positive electrode of the charging port 101; at the same time, one end of the second switch is connected to both one end of the third switch and the positive electrode of the power battery 102, and the other end The first and second ends of the second switch are respectively connected to one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch, and the sixth switch is directly connected to the positive electrode of the charging port 101; the other end of the third switch is connected to the other end of the resistor; one end of the fourth switch is connected to the negative electrode of the power battery 102, and the other end is connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch, and the other end of the seventh switch is connected to the negative electrode of the charging port 101. Through the coordinated work of these switches and elements, the control component 106 can flexibly adjust the circuit state to achieve effective control of functions such as boosting voltage, boosting current or heating during charging.

[0046] In the embodiment of the present application, the first to ninth switches are relays. Among them, the first switch is a boost charging relay, the second switch is a main positive relay, the third switch is a pre-charge relay, the fourth switch is a main negative relay, the fifth switch is a filter capacitor relay, the sixth switch is a fast charge positive relay, the seventh switch is a fast charge negative relay, the eighth switch is a self-heating relay, and the ninth switch is a boost relay.

[0047] It can be understood that the first to ninth switches in the embodiment of the present application are relays, wherein the relay type of each switch is different, the first switch is a boost charging relay, the second switch is a main positive relay, the third switch is a pre-charge relay, the fourth switch is a main negative relay, the fifth switch is a filter capacitor relay, the sixth switch is a fast charging positive relay, the seventh switch is a fast charging negative relay, the eighth switch is a self-heating relay, and the ninth switch is a boost relay.

[0048] In the embodiment of the present application, the first to ninth switches are turned off to realize the first to fourth modes, and the inverter 104 includes the first to sixth power devices.

[0049] Among them, the first to fourth modes are direct fast charging mode, boost charging mode, boost current charging mode and battery heating mode respectively; the power device is a motor controller power device.

[0050] It can be understood that the inverter 104 of the embodiment of the present application includes first to sixth power devices, and the switching among direct fast charging mode, boost charging mode, boost current charging mode and battery heating mode is realized by turning off the first to ninth switches.

[0051] In the embodiment of the present application, if the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, and the first switch, the fifth switch and the ninth switch are opened, and the charging pile charges the power battery 102.

[0052] It can be understood that if the target mode of the electric vehicle is the first mode, the embodiment of the present application closes the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch, and opens the other switches. Under this configuration, the charging pile will directly charge the power battery 102. Specifically, the current path is from the positive pole of the charging pile through the fast charging positive relay and the main positive relay to the positive pole of the power battery 102; at the same time, the current returns from the negative pole of the power battery 102 through the main negative relay and the fast charging negative relay to the negative pole of the charging pile, forming a complete charging circuit.

[0053] In an embodiment of the present application, if the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are disconnected, and the second to fifth switches, the seventh switch and the ninth switch are closed. The voltage of the power battery 102 is converted to a first preset voltage through the switching states of the first power device, the third power device and the fifth power device. The motor 105 and the inductor store energy and release energy to maintain the voltage of the second capacitor at an acceptable voltage for the charging pile. The second power device, the fourth power device and the sixth power device are closed to store energy for the motor 105 and the inductor. After the energy storage is completed, the second power device, the fourth power device and the sixth power device are closed. The energy storage of the inductor and the energy of the charging pile are superimposed to charge the power battery 102 through the first power device, the third power device and the fifth power device to increase the charging voltage.

[0054] The first preset voltage is set according to specific circumstances and is not specifically limited here.

[0055] It can be understood that if the target mode of the electric vehicle is the second mode, the embodiment of the present application disconnects the first switch, the sixth switch and the eighth switch, closes the other switches, and converts the voltage of the power battery 102 into the first preset voltage by controlling the switching states of the first power device, the third power device and the fifth power device. The voltage of the second capacitor is maintained at an acceptable voltage for the charging pile by storing and releasing energy using the motor and the inductor. The inductor is enabled to store energy by closing the second power device, the fourth power device and the sixth power device. When the inductor energy storage is completed, the second power device, the fourth power device and the sixth power device are closed to stop the energy storage process. The energy stored in the inductor is superimposed on the energy provided by the charging pile, and the power battery 102 is charged through the first power device, the third power device and the fifth power device, so that even if the voltage provided by the charging pile is low, a higher charging voltage can be achieved.

[0056] In an embodiment of the present application, if the target mode of the electric vehicle is the third mode, after the voltage of the second capacitor is charged to the second preset voltage, the second switch, the third switch, the eighth switch and the ninth switch are disconnected, the first switch and the fourth to seventh switches are closed, the first power device, the third power device and the fifth power device are closed, and the charging pile is the motor 105 and the inductor energy storage. After the energy storage is completed, the first power device, the third power device and the fifth power device are disconnected, and the energy of the inductor energy storage and the charging pile is superimposed to charge the power battery 102 through the second power device, the fourth power device and the sixth power device to increase the charging current.

[0057] The second preset voltage is set according to specific circumstances and is not specifically limited here.

[0058] It can be understood that if the target mode of the electric vehicle is the third mode, the embodiment of the present application charges the second capacitor to a predetermined second preset voltage value, then disconnects the second switch, the third switch, the eighth switch and the ninth switch, closes the first switch, the fourth switch, the fifth switch, the sixth switch and the seventh switch, and closes the first, third and fifth power devices at the same time, allowing the energy of the charging pile to be stored through the motor 105 and the inductor. When the inductor energy storage is completed, the first, third and fifth power devices are disconnected. Finally, through the second, fourth and sixth power devices, the energy stored in the inductor is combined with the energy provided by the charging pile, and acts together on the power battery 102 to increase the charging current.

[0059] In the embodiment of the present application, if the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are disconnected, the second to fourth switches and the eighth switch are closed, the first power device, the third power device and the fifth power device are closed, the upper half module of the power battery 102 is the motor 105 and the inductor for energy storage, and the first power device, the third power device and the fifth power device are closed after the energy storage is completed. The motor 105 and the inductor energy storage charge the lower half module of the power battery 102, and form an energy loop through the body diodes of the second power device, the fourth power device and the sixth power device, and the second power device, the fourth power device and the sixth power device are opened. The lower half module of the power battery 102 is the motor 105 and the inductor for energy storage. After the energy storage is completed, the second power device, the fourth power device and the sixth power device are closed, and the energy stored by the motor 105 and the inductor charges the upper half module of the power battery 102 through the first power device, the third power device and the fifth power device, and the pulsed self-heating of the power battery 102 is achieved by controlling the opening frequency and duty cycle.

[0060] It can be understood that if the target mode of the electric vehicle is the fourth mode, the embodiment of the present application disconnects the first switch, the fifth to the seventh switches and the ninth switch, closes the second to the fourth switches and the eighth switch, and then closes the first, third and fifth power devices. At this time, the upper half module of the power battery 102 begins to store energy for the motor 105 and the inductor. After the energy storage is completed, the first, third and fifth power devices are immediately closed. Subsequently, the energy stored in the motor 105 and the inductor forms an energy loop through the body diodes of the second, fourth and sixth power devices to charge the lower half module of the power battery 102. In this process, the second, fourth and sixth power devices are opened to achieve effective energy transmission. Next, the lower half module of the power battery 102 stores energy for the motor 105 and the inductor again. After the energy storage is completed, the second, fourth and sixth power devices are closed. Finally, the energy stored in the motor 105 and the inductor charges the upper half module of the power battery 102 through the first, third and fifth power devices, realizing pulsed self-heating of the power battery 102, thereby increasing the battery temperature and optimizing the performance under low temperature conditions.

[0061] According to the high-voltage charging system proposed in the embodiment of the present application, it includes a charging port and a power battery, an electric drive component and a control component. The electric drive component includes an inverter and a motor. The inverter is connected to the connection circuit of the charging port and the power battery. The motor is allowed to be connected to the charging port. The control component controls the connection of the electric drive component with the charging port during the charging process. The electric drive component is used to achieve at least one of voltage boost, current boost and heating during the charging process, thereby achieving self-heating of the power battery, improving the heating rate and temperature consistency of the power battery, and achieving a composite use of the electric drive system to achieve the lifting function, that is, boost charging, voltage reduction charging and direct charging can be achieved.

[0062] The high voltage charging system is further described below by using a specific embodiment. Figure 3 As shown, the boost and current heating system of the electric drive system includes a main positive relay K2, a pre-charge relay K3, a pre-charge resistor R1, a main negative relay K4, a fast charge positive relay K6, a fast charge negative relay K7, a current boost charging relay K1, a filter capacitor relay K5, a boost relay K9, a self-heating relay K8, a motor controller bus capacitor C1, motor controller power devices Q1, Q2, Q3, Q4, Q5 and Q6, and a charging filter capacitor C2.

[0063] This embodiment is divided into direct fast charging mode, boost charging mode, boost current charging mode, and battery self-heating mode according to the specific state of the charging pile. The implementation of these four modes will be described separately below, as follows:

[0064] 1. Direct fast charging mode

[0065] like Figure 4As shown, it is a system diagram of direct fast charging mode. At this time, K2, K3, K4, K6, and K7 are closed; relays K1, K5, and K9 are disconnected, and the external charging pile directly charges the power battery.

[0066] 2. Boost charging mode

[0067] When the system works in boost mode, K1, K6, and K8 are disconnected. Figure 5 At this time, close the relays K2, K3, K4, K5, K9, and K7; the inductor of the system is a configurable energy storage device. According to the actual effect, the inductor can be cancelled. After charging starts, due to the charging enlightenment stage, charging needs to detect the voltage platform of the vehicle. Therefore, at the beginning of charging, the system is in the step-down mode, charging the C2 capacitor, and providing a voltage that the charging pile can accept. The specific steps are as follows: Figure 6 , Figure 7 As shown, by controlling the switching states of Q1, Q3, and Q5, the voltage of the high-voltage battery pack is converted to a low voltage, and the motor and inductor are used to store and release energy to keep the voltage of the capacitor at a ground voltage acceptable to the charging pile.

[0068] like Figure 8 As shown, the power devices Q4, Q2, and Q6 are closed, and the charging pile stores energy for the motor and inductor. After the energy storage is completed, Fig. 9 As shown, Q4, Q2, and Q6 are turned off, and the energy of the inductive energy storage and the charging pile is superimposed to charge the power battery through Q1, Q3, and Q5 to increase the charging voltage.

[0069] 3. Boost charging mode

[0070] When the system operates in boost mode, during the startup phase, Figure 6 , Figure 7 After the voltage of capacitor C2 is charged to a level close to the battery pack voltage, K2, K3, K8, and K9 are disconnected. At this time, the main circuit of the system is as follows: Fig.10 At this time, close the relays K1, K4, K5, K6, and K7; the inductance of the system is a configurable energy storage device. According to the actual effect, the inductance can be cancelled. After charging begins, Fig.11 As shown, the power devices Q1, Q3, and Q5 are closed, and the charging pile stores energy for the motor and inductor. After the energy storage is completed, Fig.12 As shown, Q1, Q3, and Q5 are turned off, and the energy of the inductive energy storage and the charging pile is superimposed to charge the power battery through Q2, Q4, and Q6, thereby increasing the charging current.

[0071] 4. Battery Self-Heating Mode

[0072] When the system is in heating mode, K1, K5, K6, K9, and K7 are disconnected. Fig.13At this time, close the relays K2, K4, K3, and K8; the inductance of the system is a configurable energy storage device. According to the actual effect, the inductance can be cancelled. After charging begins, Fig.14 As shown, the power devices Q1, Q3, and Q5 are closed, and the upper module battery is used for motor and inductor energy storage. After the energy storage is completed, Fig.15 As shown, Q1, Q3, and Q5 are turned off, and the motor and inductor energy storage charge the battery of the lower half module, and form an energy loop through the body diodes of Q2, Q4, and Q6; Fig.16 As shown, Q2, Q4, and Q6 are turned on, and the lower half module battery stores energy for the motor and inductor. After the energy storage is completed, Fig.17 As shown, Q2, Q4, and Q6 are turned off, and the energy stored in the motor and inductor is used to charge the upper module battery through Q1, Q3, and Q5. The self-heating function of the pulsed battery is achieved by controlling the opening frequency and duty cycle.

[0073] Next, the high-voltage charging method proposed according to the embodiment of the present application is described with reference to the accompanying drawings.

[0074] Fig.18 It is a flow chart of the high-voltage charging method according to an embodiment of the present application.

[0075] like Fig.18 As shown, the high voltage charging method includes the following steps:

[0076] In step S201 , a target mode of the power battery is identified.

[0077] Among them, the target modes of the power battery include direct fast charging mode, boost charging mode, boost current charging mode and battery heating mode.

[0078] It can be understood that the embodiment of the present application can identify the target mode of the power battery and determine whether the target mode is one of the direct fast charging mode, the boost charging mode, the boost current charging mode or the battery heating mode.

[0079] In step S202, the closing and opening of switches in a control component of the high-voltage charging system are controlled according to the target mode, and a target circuit corresponding to the target mode is formed by closing and opening the switches in the control component.

[0080] It is understandable that the embodiments of the present application can control the closing and opening of each switch in the high-voltage charging system according to different target modes, form a required target circuit, and realize different charging modes through the target circuit.

[0081] In step S203, at least one of voltage boost, current boost and heating is implemented in the charging process based on the target circuit.

[0082] It can be understood that the embodiments of the present application control the closing and opening of each switch in the high-voltage charging system to form a desired target circuit, thereby realizing the functions of boosting voltage, increasing current and heating during the charging process.

[0083] It should be noted that the aforementioned explanation of the high-voltage charging system embodiment is also applicable to the high-voltage charging method of this embodiment, and will not be repeated here.

[0084] According to the high-voltage charging method proposed in the embodiment of the present application, by identifying the target mode of the power battery, controlling the closing and opening of the switch in the control component of the high-voltage charging system, a target circuit corresponding to the target mode is formed, and at least one of the voltage boost, current boost and heating of the charging process is realized based on the target circuit, thereby realizing self-heating of the power battery, improving the heating rate and temperature consistency of the power battery, and realizing the composite utilization of the electric drive system to realize the lifting and lowering functions, that is, boost charging, step-down charging and direct charging can be realized.

[0085] An embodiment of the present application also provides an electric vehicle, comprising the above-mentioned high-voltage charging system.

[0086] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0087] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0088] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0089] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array, a field programmable gate array, etc.

[0090] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

Claims

1. A high voltage charging system, characterized in that: include: Charging port and power battery; An electric drive assembly, wherein the electric drive assembly includes an inverter and a motor, the inverter is connected to a connection circuit between the charging port and the power battery, and the motor is allowed to be connected to the charging port; The control component is used to control the electric drive component to be connected to the charging port during the charging process, and utilize the electric drive component to achieve at least one of voltage boost, current boost and heating during the charging process.

2. The high-voltage charging system according to claim 1, characterized in that: The control component includes first to ninth switches, a resistor, an inductor and first to second capacitors, wherein: One end of the first switch is connected to the positive electrode of the power battery, the other end of the first switch is connected to one end of the fifth switch and one end of the inductor, the motor is connected to one end of the inductor, the other end of the fifth switch is respectively connected to the positive electrode of the second capacitor and one end of the ninth switch, the other end of the ninth switch is connected to the positive electrode of the charging port, one end of the second switch is respectively connected to one end of the third switch and the positive electrode of the power battery, the other end of the second switch is respectively connected to one end of the resistor, the positive electrode of the first capacitor and one end of the sixth switch, the other end of the sixth switch is connected to the positive electrode of the charging port, the other end of the third switch is connected to the other end of the resistor, one end of the fourth switch is connected to the negative electrode of the power battery, the other end of the fourth resistor is respectively connected to the negative electrode of the first capacitor, the negative electrode of the second capacitor and one end of the seventh switch, and the other end of the seventh switch is connected to the negative electrode of the charging port.

3. The high-voltage charging system according to claim 2, characterized in that: The first to ninth switches are relays.

4. The high-voltage charging system according to claim 2, characterized in that: Turning off the first to ninth switches realizes first to fourth modes, and the inverter includes first to sixth power devices.

5. The high-voltage charging system according to claim 4, characterized in that: If the target mode of the electric vehicle is the first mode, the second switch, the third switch, the fourth switch, the sixth switch and the seventh switch are closed, and the first switch, the fifth switch and the ninth switch are opened, and the charging pile charges the power battery.

6. The high-voltage charging system according to claim 4, characterized in that: If the target mode of the electric vehicle is the second mode, the first switch, the sixth switch and the eighth switch are disconnected, and the second to fifth switches, the seventh switch and the ninth switch are closed. The voltage of the power battery is converted into a first preset voltage through the switching states of the first power device, the third power device and the fifth power device. The voltage of the second capacitor is maintained at an acceptable voltage of the charging pile by storing and releasing energy through the motor and the inductor. The second power device, the fourth power device and the sixth power device are closed to store energy for the motor and the inductor. After the energy storage is completed, the second power device, the fourth power device and the sixth power device are closed. The energy stored by the inductor and the energy of the charging pile are superimposed to charge the power battery through the first power device, the third power device and the fifth power device to increase the charging voltage.

7. The high-voltage charging system according to claim 4, characterized in that: If the target mode of the electric vehicle is the third mode, after the voltage of the second capacitor is charged to the second preset voltage, the second switch, the third switch, the eighth switch and the ninth switch are disconnected, the first switch and the fourth to seventh switches are closed, the first power device, the third power device and the fifth power device are closed, and the charging pile is a motor and an inductor for energy storage. After the energy storage is completed, the first power device, the third power device and the fifth power device are disconnected, and the energy of the inductor energy storage and the charging pile is superimposed to charge the power battery through the second power device, the fourth power device and the sixth power device to increase the charging current.

8. The high-voltage charging system according to claim 4, characterized in that: If the target mode of the electric vehicle is the fourth mode, the first switch, the fifth to seventh switches and the ninth switch are disconnected, the second to fourth switches and the eighth switch are closed, the first power device, the third power device and the fifth power device are closed, the upper half module of the power battery stores energy for the motor and the inductor, and after the energy storage is completed, the first power device, the third power device and the fifth power device are closed, the energy storage of the motor and the inductor charges the lower half module of the power battery, and an energy loop is formed through the body diodes of the second power device, the fourth power device and the sixth power device, the second power device, the fourth power device and the sixth power device are opened, the lower half module of the power battery stores energy for the motor and the inductor, and after the energy storage is completed, the second power device, the fourth power device and the sixth power device are closed, the energy storage of the motor and the inductor charges the upper half module of the power battery through the first power device, the third power device and the fifth power device, and the pulsed self-heating of the power battery is achieved by controlling the opening frequency and duty cycle.

9. An electric vehicle, characterized in that: A high-voltage charging system comprising any one of claims 1-8.

10. A high voltage charging method, characterized in that: The method uses the high-voltage charging system according to any one of claims 1 to 8 for charging, wherein the method comprises the following steps: identifying a target mode of the power battery; Controlling the closing and opening of a switch in a control component of the high-voltage charging system according to the target mode, and forming a target circuit corresponding to the target mode by closing and opening the switch in the control component; At least one of voltage boost, current boost and heating is achieved during the charging process based on the target circuit.

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